1. Understand the relationship between inches and millimeters. One inch is internationally accepted as being equivalent to 25.4 millimeters. Written as an ... 2. Write down the inches measurement. To convert a measurement taken in inches, you need to begin the problem by writing down the original measurement. This ... 3. Multiply this measurement by 25.4. You need to multiply the current inches measurement by the ratio of millimeters to inches, or 25.4 mm / 1 in. The inches ...
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